Fix variables arg typo in Dataset.sortby() docstring (#8670)

* Fix `variables` arg typo in `Dataset.sortby()` docstring

* Add change to `whats-new.rst`

* Remove whitespace in `whats-new.rst`

* Update doc/whats-new.rst

Co-authored-by: Maximilian Roos <[email protected]>

---------

Co-authored-by: Maximilian Roos <[email protected]>

Author: tomvothecoder

doc/whats-new.rst

@@ -40,7 +40,9 @@ Bug fixes
 
 Documentation
 ~~~~~~~~~~~~~
-
+- Fix `variables` arg typo in `Dataset.sortby()` docstring
+  (:issue:`8663`, :pull:`8670`)
+  By `Tom Vo <https://github.com/tomvothecoder>`_.
 
 Internal Changes
 ~~~~~~~~~~~~~~~~

xarray/core/dataset.py

@@ -7947,7 +7947,7 @@ def sortby(
 
         Parameters
         ----------
-        kariables : Hashable, DataArray, sequence of Hashable or DataArray, or Callable
+        variables : Hashable, DataArray, sequence of Hashable or DataArray, or Callable
             1D DataArray objects or name(s) of 1D variable(s) in coords whose values are
             used to sort this array. If a callable, the callable is passed this object,
             and the result is used as the value for cond.